metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
Hardness: 3.5-4 on Mohs scale; Color: Silver, gold, bronze, or brown; Luster: Pearly to metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into sheets); Specific Gravity: 2.7-3.2
- Hardness
- 3
- Color
- Silver, gold, bronze, or brown
- Luster
- Pearly to metallic
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Silver, gold, bronze, or brown; Luster: Pearly to metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into sheets); Specific Gravity: 2.7-3.2
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures. This process occurs during mountain-building events (orogenies) in the Earth's crust.
Uses & applications
Used as an ornamental stone, in wall cladding, as a source for industrial mica in electronics and cosmetics, and as a decorative garden stone.
Geological facts
The word schist comes from the Greek word 'schistos,' meaning 'cleft,' referring to the ease with which it splits into thin layers. Schist accounts for a significant portion of the Earth's continental crust.
Field identification & locations
Identified by its distinctive 'schistosity' or foliated texture where individual mineral grains (usually mica) are visible to the naked eye and sparkle in light. Commonly found in metamorphic belts like the Alps or the Appalachians.
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